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basic element system

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Ellpeck 2019-08-09 18:26:28 +02:00
parent 6d54eb4da3
commit a67abd4661
4 changed files with 317 additions and 7 deletions
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210
MLEM.Ui/Elements/Element.cs Normal file
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@ -0,0 +1,210 @@
using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Extensions;
namespace MLEM.Ui.Elements {
public class Element {
private Anchor anchor;
private Point size;
private Point offset;
private Point padding;
public Anchor Anchor {
get => this.anchor;
set {
this.anchor = value;
this.SetDirty();
}
}
public Point Size {
get => this.size;
set {
this.size = value;
this.SetDirty();
}
}
public Point PositionOffset {
get => this.offset;
set {
this.offset = value;
this.SetDirty();
}
}
public Point Padding {
get => this.padding;
set {
this.padding = value;
this.SetDirty();
}
}
public UiSystem System;
public Element Parent { get; private set; }
private readonly List<Element> children = new List<Element>();
private Rectangle area;
public Rectangle Area {
get {
this.UpdateAreaIfDirty();
return this.area;
}
}
public Rectangle DisplayArea {
get {
var padded = this.Area;
padded.Location += this.Padding;
padded.Width -= this.Padding.X * 2;
padded.Height -= this.Padding.Y * 2;
return padded;
}
}
protected bool AreaDirty;
public Element(Anchor anchor, Point size, Point positionOffset) {
this.anchor = anchor;
this.size = size;
this.offset = positionOffset;
}
public void AddChild(Element element) {
this.children.Add(element);
element.Parent = this;
this.SetDirty();
}
public void RemoveChild(Element element) {
this.children.Remove(element);
element.Parent = null;
this.SetDirty();
}
public void SetDirty() {
this.AreaDirty = true;
}
public void UpdateAreaIfDirty() {
if (this.AreaDirty)
this.ForceUpdateArea();
}
public void ForceUpdateArea() {
this.AreaDirty = false;
var parentArea = this.Parent != null ? this.Parent.area : this.System.ScaledViewport;
var parentCenterX = parentArea.X + parentArea.Width / 2;
var parentCenterY = parentArea.Y + parentArea.Height / 2;
var actualSize = this.CalcActualSize();
var pos = new Point();
switch (this.anchor) {
case Anchor.TopLeft:
case Anchor.AutoLeft:
case Anchor.AutoInline:
case Anchor.AutoInlineIgnoreOverflow:
pos.X = parentArea.X + this.offset.X;
pos.Y = parentArea.Y + this.offset.Y;
break;
case Anchor.TopCenter:
case Anchor.AutoCenter:
pos.X = parentCenterX - actualSize.X / 2 + this.offset.X;
pos.Y = parentArea.Y + this.offset.Y;
break;
case Anchor.TopRight:
case Anchor.AutoRight:
pos.X = parentArea.Right - actualSize.X - this.offset.X;
pos.Y = parentArea.Y + this.offset.Y;
break;
case Anchor.CenterLeft:
pos.X = parentArea.X + this.offset.X;
pos.Y = parentCenterY - actualSize.Y / 2 + this.offset.Y;
break;
case Anchor.Center:
pos.X = parentCenterX - actualSize.X / 2 + this.offset.X;
pos.Y = parentCenterY - actualSize.Y / 2 + this.offset.Y;
break;
case Anchor.CenterRight:
pos.X = parentArea.Right - actualSize.X - this.offset.X;
pos.Y = parentCenterY - actualSize.Y / 2 + this.offset.Y;
break;
case Anchor.BottomLeft:
pos.X = parentArea.X + this.offset.X;
pos.Y = parentArea.Bottom - actualSize.Y - this.offset.Y;
break;
case Anchor.BottomCenter:
pos.X = parentCenterX - actualSize.X / 2 + this.offset.X;
pos.Y = parentArea.Bottom - actualSize.Y - this.offset.Y;
break;
case Anchor.BottomRight:
pos.X = parentArea.Right - actualSize.X - this.offset.X;
pos.Y = parentArea.Bottom - actualSize.Y - this.offset.Y;
break;
}
if (this.Anchor >= Anchor.AutoLeft) {
var previousChild = this.GetPreviousChild();
if (previousChild != null) {
var prevArea = previousChild.Area;
switch (this.Anchor) {
case Anchor.AutoLeft:
case Anchor.AutoCenter:
case Anchor.AutoRight:
pos.Y = prevArea.Bottom + this.PositionOffset.Y;
break;
case Anchor.AutoInline:
var newX = prevArea.Right + this.PositionOffset.X;
if (newX + actualSize.X <= parentArea.Right) {
pos.X = newX;
pos.Y = prevArea.Y;
} else {
pos.Y = prevArea.Bottom + this.PositionOffset.Y;
}
break;
case Anchor.AutoInlineIgnoreOverflow:
pos.X = prevArea.Right + this.PositionOffset.X;
pos.Y = prevArea.Y;
break;
}
}
}
this.area = new Rectangle(pos, actualSize);
foreach (var child in this.children)
child.ForceUpdateArea();
}
private Point CalcActualSize() {
return this.size;
}
public Element GetPreviousChild() {
if (this.Parent == null)
return null;
Element lastChild = null;
foreach (var child in this.Parent.children) {
if (child == this)
break;
lastChild = child;
}
return lastChild;
}
public void Update(GameTime time) {
foreach (var child in this.children)
child.Update(time);
}
public void Draw(GameTime time, SpriteBatch batch) {
batch.Draw(batch.GetBlankTexture(), this.DisplayArea, this.Parent == null ? Color.Blue : Color.Red);
foreach (var child in this.children)
child.Draw(time, batch);
}
}
}

80
MLEM.Ui/UiSystem.cs Normal file
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@ -0,0 +1,80 @@
using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Extensions;
using MLEM.Ui.Elements;
namespace MLEM.Ui {
public class UiSystem {
private readonly GraphicsDevice graphicsDevice;
private readonly List<RootElement> rootElements = new List<RootElement>();
public float GlobalScale;
public Rectangle ScaledViewport {
get {
var bounds = this.graphicsDevice.Viewport.Bounds;
return new Rectangle(bounds.X, bounds.Y, (bounds.Width / this.GlobalScale).Floor(), (bounds.Height / this.GlobalScale).Floor());
}
}
public UiSystem(GameWindow window, GraphicsDevice device, float scale) {
this.graphicsDevice = device;
this.GlobalScale = scale;
window.ClientSizeChanged += (sender, args) => {
foreach (var root in this.rootElements)
root.Element.ForceUpdateArea();
};
}
public void Update(GameTime time) {
foreach (var root in this.rootElements)
root.Element.Update(time);
}
public void Draw(GameTime time, SpriteBatch batch, BlendState blendState = null, SamplerState samplerState = null) {
batch.Begin(SpriteSortMode.Deferred, blendState, samplerState, transformMatrix: Matrix.CreateScale(this.GlobalScale));
foreach (var root in this.rootElements)
root.Element.Draw(time, batch);
batch.End();
}
public void Add(string name, Element root) {
if (this.IndexOf(name) >= 0)
throw new ArgumentException($"There is already a root element with name {name}");
this.rootElements.Add(new RootElement(name, root));
root.System = this;
}
public void Remove(string name) {
var index = this.IndexOf(name);
if (index < 0)
return;
this.rootElements.RemoveAt(index);
}
public Element Get(string name) {
var index = this.IndexOf(name);
return index < 0 ? null : this.rootElements[index].Element;
}
private int IndexOf(string name) {
return this.rootElements.FindIndex(element => element.Name == name);
}
}
public struct RootElement {
public readonly string Name;
public readonly Element Element;
public RootElement(string name, Element element) {
this.Name = name;
this.Element = element;
}
}
}

19
Tests/GameImpl.cs
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@ -6,6 +6,8 @@ using MLEM.Extended.Extensions;
using MLEM.Input;
using MLEM.Startup;
using MLEM.Textures;
using MLEM.Ui;
using MLEM.Ui.Elements;
using MonoGame.Extended.TextureAtlases;
namespace Tests {
@ -16,12 +18,25 @@ namespace Tests {
private NinePatch testPatch;
private NinePatchRegion2D extendedPatch;
private UiSystem uiSystem;
private Element testChild;
protected override void LoadContent() {
base.LoadContent();
this.testTexture = LoadContent<Texture2D>("Textures/Test");
this.testRegion = new TextureRegion(this.testTexture, 32, 0, 8, 8);
this.testPatch = new NinePatch(new TextureRegion(this.testTexture, 0, 8, 24, 24), 8);
this.extendedPatch = this.testPatch.ToExtended();
// Ui system tests
this.uiSystem = new UiSystem(this.Window, this.GraphicsDevice, 5);
var root = new Element(Anchor.BottomLeft, new Point(100, 100), new Point(5, 5));
for (var i = 0; i < 3; i++)
root.AddChild(new Element(Anchor.AutoInline, new Point(16, 16), Point.Zero) {
Padding = new Point(1, 1)
});
this.uiSystem.Add("Test", root);
}
protected override void Update(GameTime gameTime) {
@ -34,6 +49,8 @@ namespace Tests {
Console.WriteLine("Left was pressed");
if (Input.IsGamepadButtonPressed(0, Buttons.A))
Console.WriteLine("Gamepad A was pressed");
this.uiSystem.Update(gameTime);
}
protected override void Draw(GameTime gameTime) {
@ -49,6 +66,8 @@ namespace Tests {
this.SpriteBatch.Draw(this.testPatch, new Rectangle(20, 20, 40, 20), Color.White);
this.SpriteBatch.Draw(this.extendedPatch, new Rectangle(80, 20, 40, 20), Color.White);
this.SpriteBatch.End();
this.uiSystem.Draw(gameTime, this.SpriteBatch);
}
}

15
Tests/Tests.csproj
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@ -6,19 +6,20 @@
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="..\MLEM.Extended\MLEM.Extended.csproj"/>
<ProjectReference Include="..\MLEM.Startup\MLEM.Startup.csproj"/>
<ProjectReference Include="..\MLEM\MLEM.csproj"/>
<ProjectReference Include="..\MLEM.Extended\MLEM.Extended.csproj" />
<ProjectReference Include="..\MLEM.Startup\MLEM.Startup.csproj" />
<ProjectReference Include="..\MLEM.Ui\MLEM.Ui.csproj" />
<ProjectReference Include="..\MLEM\MLEM.csproj" />
</ItemGroup>
<ItemGroup>
<PackageReference Include="MonoGame.Content.Builder" Version="3.7.0.9"/>
<PackageReference Include="MonoGame.Framework.DesktopGL.Core" Version="3.7.0.7"/>
<PackageReference Include="MonoGame.Content.Builder" Version="3.7.0.9" />
<PackageReference Include="MonoGame.Framework.DesktopGL.Core" Version="3.7.0.7" />
</ItemGroup>
<ItemGroup>
<MonoGameContentReference Include="Content\Content.mgcb"/>
<Content Include="Content\*\**"/>
<MonoGameContentReference Include="Content\Content.mgcb" />
<Content Include="Content\*\**" />
</ItemGroup>
</Project>